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INVESTMENT SECURITIES - Narrative (Details) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2025 USD ($) issuer | Mar. 31, 2024 USD ($) issuer
Defined Benefit Plan Disclosure [Line Items] |  |
Number of issuers | issuer | 2 | 2
Investment securities | $ 2,814,733 | $ 3,905,241
Recognized impairment loss in Income Statement | 406 | 413
Fair value of held-to-maturity | 64,952 |
Non-US sovereign debt |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Recognized impairment loss in Income Statement | 378 | $ 352
Fair value of held-to-maturity | 64,952 |
Fair value, inputs, level 1 | Non-US sovereign debt |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of held-to-maturity | 45,216 |
Fair value, inputs, level 2 | Non-US sovereign debt |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of held-to-maturity | $ 19,736 |
Kazakhstan Sustainability Fund JSC |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of trading securities (in percent) | 10.00% | 10.00%
Investment securities | $ 578,862 | $ 727,440
Ministry of Finance of the Republic of Kazakhstan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of trading securities (in percent) | 10.00% | 10.00%
Investment securities | $ 1,527,340 | $ 2,420,855

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